A and B can paint a house in 12 days. B alone takes 20 days. How long for A?

A25 days

B30 days

C35 days

D40 days

Explanation

A+B=1/12, B=1/20. A = 1/12 – 1/20 = (5-3)/60 = 2/60 = 1/30. A = 30 days.

Exam Relevance

Topic: Work and Time
Subtopic: Individual Work

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